Hoisting-drum.



A. E. HOLGOMB. HOISTING DRUM. APPLICATION 1 11.31) 00T.22,1906.

- 903,819. Patented N0v. 10, 1 908.

2 SHEETS-SHEET l.

UNITED STATES PATENT OFFICE.

ALPHEUS ELTON HOLCOMB, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TOFRANCIS M. JOHNSON, OF OREGON, ILLINOIS.

HOISTING-DRUM.

Specification of Letters Patent.

Application filed October 22, 1906.

Patented Nov. 10, 1908.

Serial No. 339,981.

that class of hoisting drums which are used for closing and raising andholding and lowering orange peel or clam shell buckets, and the like,wherein is provided a cable for closing and raising the bucket and asecond cable for holding the bucket while it opens by means of gravity.

It has heretofore been the custom with hoisting machinery to provide twowinding drums, operable independently of each other,

one having the raising and closing cable wound thereon and the otherhaving the holding and lowering cable woimd thereon, and to providemeans whereby the operator may control each drum. Under suchcircumstances, it is necessary for the operator to be skilful in themanipulation of the levers for throwing into and out of operation thedifferent drums, especially where the holding and lowering rope is usedto assist the closing and raising rope in hoisting the bucket. If, underthese circumstances, the drum for the holding and lowering rope isthrown into engagement too soon, it will permit the closing and raisingrope to 'slacken and open the bucket. If the drum of the holding rope isnot thrown into operation soon enough, then it is inefiectual inassisting the other cable in raising the load. Furthermore, instructures of this kind, when it is desired to dump a load and theholding and lowering rope is not taut and when the closing and raisingcable is released, the bucket drops upon the holding cable, causingundue strain upon the machinery, and frequently causing the dumping ofthe load at a point not contemplated by the operator.

It is the object of my present invention to overcome the aboveobjections.

Other objects of my invention will appear in the following specificationand claims.

I have illustrated in the accompanying drawings for the purpose ofdisclosing my invention, one means of constructing my device.

In said drawings, Figure 1 is a longitudinal section of my hoistingmechanism; Figs. 2 and 3 are a side and end elevation of the spider forconnecting the two drums of the hoisting mechanism together; Fig. 4 is asectional view taken on line 4-4 of Fig. 1; Fig. 5 is a sectional viewtaken on line 55 of Fig. 1; Fig. 6 is a sectional view taken on line 66of Fig. 1; Fig. 7 is a view of one form of bucket used with my hoistingdevice.

In the embodiment of my invention illustrated in the drawings upon theend members 1 of a suitable frame I mount a shaft 2 whichv at its outerend has keyed thereto, a gear 4 driven by a pinion of the operatingmotor. Loosely mounted upon the shaft 2 between the end members of theframe is a pair of hoisting drums 5 and 6, the drum 5 having woundthereon the bucket holding and opening cable, and the drum 6 havingwound thereon the bucket closing and hoisting cable.

The hub 7 of the drum 5 has an extension 8 thereon upon which isrotatably mounted a pulley 9, which when the drum 5 is rotated in thedirection of the arrow (Fig. 4) is arranged to be connected with thedrum through the rollers 10 operating in the transverse cam slots 11 onthe periphery of the end of the drum. These rollers are held in positionin the space formed between the inner periphery of the pulley and theend of the drum by means of a ring like member 12 which is arranged tobe screwed to one end of the periphery of the pulley 9. Surrounding thepulley 9 is a brake band 13 which is arranged to make frictionalengagement with the periphery of the pulley and hold the same when thebrake operating mechanism is operated. One end of the brake band issecured to the strap end 14, which has eX- tending therefrom a bolt 15arranged at its end to pass through a lug 16 formed on the side 1 of theframe and be held in position quent that this brake is used.

by nuts 17. The opposite end of the brake band after passing around theperiphery of the pulley 9 is secured to the strap end 18, which isprovided with an extension 19 pivotally connected at 20 to the lever 21.

has its outer free end connected by means of a rod 23 with any suitableoperating means as a lever. By depressing the outer end of the lever 21it will be readily seen that the inner end thereof will move the brakeband pulley. It will be noted, however, that due to the cam and rollerconnection between the drum and the brake band pulley that the drum maybe rotated in the opposite direction without being affected by the brakeband. By this arrangement the brake may be set and will not affect therotation of the drum in winding the cable but will operate as soon asthe hauling of the bucket stops and the full weight of the bucket iscarried by the holding cable.

The drum 6 on which is wound the closing and hoisting cable is alsoloosely mounted upon the shaft 2 and is provided with a hold ing brake24:. The brake band and operating mechanism therefore are substantiallythe same as the brake band described in connection with the holding drum5. The loose connection between the brake band and the drum, however,which permits the rotation of the drum in one direction and whichpermits the operation of the brake band only when the drum is operatedin a reverse direction, is not used in connection with the closing andhoisting drum as it is not fre- The drum 6 is connected with the shaft 2through the mechanism of the friction clutch. This clutch comprises ahub 25 which fits within the drum, and has arranged on the peripherythereof a series of flat rings 26 provided on their opposite faces witha suitable bearing surface 27. The inner edges of these rings are cutout as at 28 (Fig. 5) to receive projections 29 formed on the hub 25,whereby while the rings will slip laterally on the hub, they will berotated therewith.

Inter-posed between the rings 26 are a plurality of flat rings whichhave projections 30 formed thereon arranged to fit within longitudinalslots 31 formed in the inner periphery of the drum 6. The outer ring onthe hub 25 has a projection 32 which is arranged to engage the end ofthe set screw 33 carried upon a lever 34 pivotally mounted upon a disk36 which is securely bolted to and becomes an integral part of the hubThe. lever 21 is pivoted at 22 to the frame 1 and 25. The drum 6 isprevented from any end play by the retaining ring 37. Mounted on the hub25 near the shaft is a second lever 38, the end 39 of which is arrangedto engage the lower end of the lever 34- when the outer end of the lever38 is raised. A cor responding set of levers is mounted upon theopposite side of the shaft and the levers 38 of both sets are spread bya beveled member loosely mounted upon the shaft 2, which may be movedtoward or away from the levers 38 by means of any lever connection. henthe beveled member 35 is moved toward the levers 38, it spreads thesame, causing the screw 33 to engage the projection 32 of the outer ringof the clutch mechanism and the rings of the clutch will be compressedupon one another and the hub which is keyed upon the shaft 2 and thedrum 6 frictionally connected together.

The means for automatically throwing into operation the drum 5 at theproper moment after the cable operated by the drum 6 has closed thebucket and causing the drum 5 to rotate with the drum (3 and wind itscable, comprises a hub 40 loosely mounted upon the shaft 2 andprojecting in a recess formed in the end of the drum 5. This hub hasextending rigidly therefrom between the ends of the drums 5 and 6, aspider 11, the ends of which are connected by bolts 42 to a flange 43formed on the end of the drum 6. At the inner end of the hub a0 is astop ring 414- which is bolted to the hub by means of bolts 45 andoperating upon screw threads 46 formed on the periphery of the hub is anut 47 having a feathered connection with the drum 5. The nut 47 islimited in its movement upon the hub 40 by the stop 4L4 at one end andthe spider 41 at the other end, and the time required for the nut 47 totravel from one end of the hub to the other is equal to the time ittakes for the closing and hoisting cable to close the bucket.

In operation, assuming that the nut at? is at the extreme right and thatthe bucket is open, the clutch mechanism for connecting the drum 6 withthe driving shaft 2 is thrown into operation, and the drum '6 will becaused to rotate, winding the closing and hoisting cable. As the drum 6is rotated, due to the threaded engagement thereof with the hub, the nut47 will travel along the hub toward the opposite end thereof, and whenthe closing and hoisting cable has been wound sufiiciently to close thebucket, the nut 17 will jam against the abutment 4a causing the drum 5to rotate and wind its cable. The bucket can now be hoisted to anydesired position. \Vhen the bucket has been hoisted to the desiredposition it may be swung to any point where it is desired to dump thesame, and the brake 13 is then applied holding the drum 5, and at thesame time the clutch on the drum 6 is released.

This permits the drum 6 to rotate freely in a reverse direction whilethe bucket opens, the nut 47 being moved back along its thread. When thebucket is fully opened and the contents dumped, it may be lowered bygradually allowing the drum 5 to rotate upon the release of the brake13.

I have illustrated in Fig. 7 the conven-' second drum to the first afterthe first drum has rotated for a predetermined period.

2. The combination with a shaft, of a pair of drums mounted thereon, athreaded member connected to one of said drums, a nut adapted to travelon said threaded member and connected to the other of said drums, andstops for limiting the movement of said nut to cause the drum to whichit is connected to rotate with said threaded member.

3. The combination with a shaft, of a pair of drums loosely mountedthereon, a brake for one of said drums for holding the same, and meansfor automatically connecting the other of said drums to said first drumafter it has rotated for a predetermined period.

4. The combination with a shaft, of a pair of hoisting drums looselymounted thereon, a clutch for connecting one of said drums to saidshaft, and means automatically operated by the rotation of said drum forconnecting the second drum to the first drum after the first drum hasrotated for a predetermined interval.

5. The combination with a shaft, of a pair of drums loosely mountedthereon, a clutch for connecting one of said drums to the shaft, athreaded member connected to said drum, a nut connected to the other ofsaid drums and 0 erating on said threaded member, stops or limiting thetravel of said nut on said threaded member, and a brake for said seconddrum.

6. The combination with a pair of hoisting drums, of a ring, and meansfor connecting said ring with one of said drums and permitting a lateralmovement thereof, a threaded bearing connected with the other drums forcausing a lateral movement of said ring, and means for limiting themovement of said ring on said threaded bearing.

In witness whereof, I have hereunto subscribed my name in the presenceof two witnesses.

ALPHEUS ELTON HOLCOMB. Witnesses:

E. R. KING, ROBERT LEWIS Arms.

